Whereas green hydrogen is produced by splitting water into hydrogen and oxygen, blue hydrogen is made from fossil sources like organic gas as well as the resulting CO2 is getting captured and stored. Hydrogen then passes through the membrane and ejects about the cathode facet. PEM electrolyzers operate at best https://danteuhteo.empirewiki.com/9143518/new_step_by_step_map_for_pem_electrolysis